Permissions Module

[rylev]

This PR cleans the Cosmos permissions related code. This is preparation for eventually moving all Cosmos models (i.e., Permissions, Databases, Stored Procedures, etc.) into their own module.

Highlights of the changes here:

• Rename AuthorizationToken::Master to AuthorizationToken::Primary as the docs have begun to transition to this nomenclature.
• Rearrange the module structure so that all permissions related types are grouped together.
• Add docs for all the Permissions related types
• Removed types that only existed for deserialization and added some serde attributes for correctly deserializing into the main type.
• Removed PermissionResource as it wasn't really being used for much and made the code more complicated

TODO: I need to run the examples to ensure that the code still works 😄

[MindFlavor]

Excellent work! I'm going to run the examples and the E2E tests and approve it.

[MindFlavor]

The E2E tests fail to compile because of #89 (we should have tested it then but it slipped because of #49). Can you please fix the errors (it should be just a matter of renaming the with_xxx_client to into_xxx_client)? You can kick off the E2E tests compilation with cargo test --features=test_e2e.

[rylev]

@MindFlavor Sorry that I broke things! I'm going to make sure I'm running the e2e before submitting PRs from now on.

[rylev]

@MindFlavor This should be good to go now!

[MindFlavor]

Just a little typo in one test. Once fixed we can merge this!